I know this is an old thread, however I thought I'd share some info. I own one of these highly prized rifles. It is complete with diopter sights, mount and original paperwork and in like new condition. I traded a national match Springfield 1903 for it a couple years ago. It's chambered in the 7.5x55 Swiss. It is absolutely the finest rifle I have ever owned and I've owned pretty much everything. I've been working loads for it for 1000 yrd. shooting. Irrespective of the load it easily produces 3/4 to 1/2 MOA groups and has produced groups approaching 1/4 MOA. I've mounted a Leupold 6x18 VariX II target scope which is period for the rifle. The mounts were easy. 2 piece Leupold with Warn steel rings.
As for the ballistics, the 7.5x55 Swiss in a modern rifle is formidable to say the least. I have it moving a Hornady 178 gr match bullet at 2850 fps using a relatively slow powder, like Reloder 22 or Power Pro 4000-MR in the mid 50's grain of powder on top of CCI BR primers. FYI, the 7.5x55 case and the 30.06 case, not including the neck hold virtually the same amount of powder with the 30.06 case perhaps having 1 to 2 gr. advantage.
If I have only one rifle left it will be this one. I believe the only reason these, when you can find one, are even remotely reasonably priced is because nobody knows what they are and info. about them is very little. The only real world comparison I could make as to value is take a look at the other Steyr tactical rifles that are sold now. I think these in the laminate unpainted stocks were made for only a year I think in 1996.